An Explanation of Effect of Age Difference in Second Language Acquisition

다국어 초록 (Multilingual Abstract)

This paper has explained the age effect on second language learners' pronunciation. By suggesting a perspective in interpreting the L2 learners' ultimate attainment in pronunciation by age differences within the framework of a biologically critical period in SLA, this paper has tried to defend the Maturational Constraints Hypothesis. The paper has, on the basis of a critical period, discussed the CPH-supporting evidence and the counter- evidence to the CPH. The CPH is not able to account for the latter evidence. Biologically-based on the critical period, this paper suggests the maturational constraints hypothesis, which plausibly seems to compensate the CPH for its imperfect explanation for exceptionally advanced adult learners' ultimate attainment in L2 pronunciation and, at the same time, acknowledge the function of the critical period. In the maturational vs. non-maturational constraints framework of the hypothesis, the ultimate attainment by age differences in L2 pronunciation is explained.

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